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(11) | EP 0 129 350 A3 |
(12) | EUROPEAN PATENT APPLICATION |
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(54) | Method and apparatus for detecting firing of perforating gun |
(57) The present invention provides a method and apparatus for detecting complete firing
of a perforating gun (24), particularly a perforating gun suspended on a string of
tubing (14). The apparatus includes a time delay device (40) coupled to the lower
end of the perforating gun (24) and arranged for ignition by an ignition train within
the perforating gun. Completefiring of the perforating gun ignites the time delay
device, which produces a distinctive signal. The distinctive signal is detected at
the surface by at least one transducer (40), which is coupled to a recorder assembly
(48). The recorder assembly provides an indication as to whether the perforating gun
fired as intended. |